The Roman Catholic Diocese of Sioux City (Latin: Dioecesis Siopolitanensis) is the Roman Catholic diocese for the northwestern quarter of the US state of Iowa. The diocese comprises 24 counties in northwestern Iowa and it covers an area of 14518 square miles (37600 km2). The See city for the diocese is Sioux City. It is a suffragan see of the Archdiocese of Dubuque. The cathedral parish for this diocese is the Epiphany. R.
